Measuring tape having check device for automatically preventing ruler from rewinding
US6491248B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Aug 21, 2001 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Aug 21, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B3/1005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measuring tape has a check device for automatically preventing a ruler from rewinding. The check device is installed within the casing and positioned between a winding wheel and a ruler body. The check device comprises a rotary wheel formed by an elastic wheel and two ratchets; a guide block having stop blocks; a stop claw; a driven element installed between the press button and the stop claw; and a press. By above components, the ruler body can be installed between the elastic wheel and the guide block. As the ruler body is pulled out, it can be stopped automatically. Only after pressing the press button, the ruler body rewinds. Thereby, the user may operate it by only one hand not to worry about that the hand will be hurt due to the rewinding of the ruler body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.